The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Deployable radiator is a radiation cooling device which is folded next to side wall of spacecraft while launching, and can expand itself after the spacecraft is on track. It can effectively improve the cooling capacity of the spacecraft. In this paper, the current research and development situations of the deployable radiator were studied and analyzed. Depending on this, design and simulation of the...
The structure of switch table mode direct torque control (DTC) is simple, in which the stator flux space is divided into 6 regions. But traditional stator flux sector judgment is much more time-consuming due to the trigonometric calculations in the orthogonal stationary coordinates. A new method is proposed to make stator flux sector judgment which is implemented in 60° coordinate system.
Confronted with severe environment issues, large scale utilization and development of wind energy and solar energy that are regenerative, non-pollution, green and clean, the best way for power generation and grid synchronization of distributed energy is to develop intelligence micro-grid. Amongst micro-grid, batteries will be connected with super capacitors to form hybrid energy storage system. Batteries...
Subband adaptive filter algorithms are able to improve the convergence behavior by performing the prewhitening procedure on the input signals. In this paper, we propose a new variable step size improved multiband-structured subband adaptive filter algorithm which dynamically selects subband filters (VSS-IMASF) in order to improve the steadystate performance. The step size is controlled by the estimated...
A triple-band compact antenna fed by coplanar waveguide (CPW) suitable for indoor communication is presented in this paper. The proposed structure is the combination of a complementary split-ring resonator (CSRR) and a left-handed transmission line (LHTL). The CSRR, working in quarter-wave monopole mode, contributes the first two operating frequency bands, which are further broadened by an additional...
As the semiconductor technology node shrinks to 28 nm and beyond, not only the difficulty of lithographic process becomes higher and higher, the design rule setup is becoming more challenging. As the critical dimension (CD) enters the range that it shrinks faster than the shrink of the coherence length, which is defined by both numerical aperture and degree of coherence in the illumination condition...
In view of the precise trajectory tracking control problem for unmanned aerial vehicle (UAV), a control method combined nonlinear path-following guidance law with active disturbance rejection control (ADRC) is proposed in this paper. The method consists of outer trajectory control loop and inner attitude control loop. An improved nonlinear path-following guidance method is used in designing the trajectory...
In this paper, we investigate the utility-based resource allocation problem in OFDMA relay networks with service differentiation, where Rate Constraint (RC) and Best Effort (BE) services are supported. Our objective of resource allocation is to maximize the sum utility of BE service users, while guaranteeing that the utility of each RC service user is equal to one. A joint optimization problem for...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.